Ergonomic aspects and productivity of different pruning tools for a first pruning lift of <i>Eucalyptus grandis</i> Hill ex Maiden

• Main Authors: Nutto, Leif, Malinovski, Ricardo, Brunsmeier, Martin, Schumacher Sant’Anna, Felipe
• Format: Article
• Language: English
• Published: Finnish Society of Forest Science 2013-01-01
• Series: Silva Fennica
• Online Access: https://www.silvafennica.fi/article/1026

For the substitution of wood from tropical rainforests pruning of for producing valuable hardwoods in short rotation plantations has become important. Existing tools and ergonomic aspects of pruning were not yet well analysed under these conditions. The objective of the study is to evaluate the productivity and ergonomics of three different pruning tools in a pruning lift up to 3 m in height. The trees used in the study came from an 18-month-old clonal stand planted in a 5.0 x 2.8 m spacing. Two manual pruning tools and an electric shear were tested for productivity by using time studies. Ergonomic aspects were evaluated by two test persons using pulse meter equipment. The highest productivity could be shown for the electric shear (236 trees per working day), followed by the manual shear (196 trees/day) and the handsaw (180 trees/day). The heartbeat rate of the two test persons ranged from a level of âvery hard workâ for the manual tools to âmiddle hardâ and âhard workâ for the electric shear. The workload level to achieve the productivity currently reached in practice using purely manual tools is extremely high, exceeding the permanent working capacity of the operators and leading to physical degradation on the long run.EucalyptusEucalyptus grandis